Siebold tāˈōdōr ĕrnst [key], 1804–85, also a physician, was one of the foremost biologists of his time. He specialized in the comparative anatomy of invertebrates and wrote the first volume (1846) of Lehrbuch der vergleichenden Anatomie; this volume appeared in English under the title Anatomy of the Invertebrata (1854). Especially noteworthy are his research on intestinal parasites and his work on the classification of invertebrates. He taught from 1853 at the Univ. of Munich.

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